Wire rope.



' c e. ROEBLING.-

WIRE ROPE. APPLIQAUON FILED AHLZB. I915.

Patented Mar. 26, 1918.

UNKTED TATE PATENT @FlFUbCit-il.

CHARLES G. ROEBLING, OF TREN'I'ON, NEW JERSEY, ASSIGNOR TO JOHNRUEBLINGS l SONS COMPANY, A CORPORATION OF NEW JERSEY.

WIRE ROPE.

Specification of Letcers Patent. Patentgd m 2.1; j gjg.

Application filed April 26, 1915. Serial No. 23,960.

' New Jersey, have invented certain new and useful Improvements in \VireRope, fully described and represented in the following specification andthe accompanying drawings forming a part of the same.

The'especial object of the invention is to provide an improved wire ropecomposed of amumber of strands which shall be of greater flexibility,strength and durability than previous wire ropes, and the inventionrelates particularly to a novel construction of the strands for suchropes. The strands embodying the invention, however, may be used as aone strand,rope, and such use is included withinthe invention.

The invention includes a novel strand composed of a core and threelayers of wires. in which the wires are so selected and stranded thatthe cross-lay and consequent nicking resulting from the old method oflaying up such strands are entirely avoided, and a large increase inmetallic area and consequent increase in tensile strength secured, whilethe construction secures compactness and the wires are locked inposition so as to prevent their being displaced in service.

As a full understanding of the invention can best be given by adescription of a construction embodying the same, such a descriptionwill now be .given in connection with the accompanying drawing showingsome of the preferred forms of embodiment of the invention, and thefeatures forming the invention will then be specifically pointed out inthe claims.

In the drawings:

Figure l is a cross section of a 37 wire strand or rope embodying theinvention.

Fig. 2 isa side elevation of the same.

Figs. 3 and 4 are views similar to Fig. 1 showing, respectively, 29 and41 wire strands or ropes.

Fig. 5 is a cross section of a wire rope made up of a core and sixstrands, such as shown in Fig. 1.

Referring now especially to Figs. 1 and 2, a is the core of the strandor rope, which, core may be of wire, hemp or other material. Around thiscore and wound compactly upon the core, side by side. are nine wlres Z2forming the inner layer of the threelayer rope. Around the outside ofthe wires 6 are wound an equal number of wires (7, these wires beinglaid in the interstices be tween each pair of wires Z) and being of suchsize as to form a complete covering layer. Outside the wires 0 are laidwires (Z in the interstices between each pair of wires 0, and betweenthese wires (7 are laid small wires e, which rest upon the erown of thewires throughout their length. so as to produce a continuous bearingwithout a ny cross-lay, the outer layer of wires thus eon sisting oftwice the number of wires in the first and second layers. It will beunderstood that all the wires ?1, 1-, (7. c. are laid up with the samelay, so that the wires r' are interlocked in the interstices between thewires 6 throughout their length. a. d the. wires (Z similarlyinterlocked in the interstices between the wires while the wires arelocked in position between the larger wires (Z. The wires (I, e. willpreferably. as shown, have such ratio in diameters 11s to producesubstantially a round strand.

In Fig. '5 there is shown a rope consisting of a core A and six strandsB. such as shown in Figs. 1 and 2. laid thereon. It will be understoodthat the number of strands used in making up the rope may be varied, asusual or desired, the six strand rope being shown only for purpose ofillustration.

The strand or rope shown in Fig. 3 is the same in principle as thatshown in Fig. 1. 'but is a 29 strand rope, being composed of an innercore f of wire. hemp, or other material, and has a layer of seven wires1 laid about the core. a second layer of seven larger wires 71 laid uponthe wires g. and an outer layer of fourteen alternating large and smallwires 2', 7., as described in connection with Figs. 1 and 2.

The. strand or rope shown in F ig. l is the same in principle as that ofFigs. 1 and 3, but" is a 41 wire strand, having an inner core Z, aninner layer of ten wires m. a second layer of ten wires 11, and an outerlayer of twenty alternating large and small wires 0,

From the, above description and illustration of three strands made upoi": differing numbers of wires, the applied-ion of the ins .d'erstood.- a f It will be a continuous I their original position sidedisplacement or creeping of the indi invention in making up strandshaving other. numbers of wires will readily be unseen that-thearrangements of wires in the strands above shown and described avoid toa great extent air spaces or voids and thus secure an increase inmetallic area for a given diameter of strand, and a' correspondingincrease in tensile strength of the strand. Gross-lay or one pointbearings of any of the wires of any of the outerlayers on the wires ofthe next inner layer-is also avoided, thus securing increased strengthand efliciency due to the elimination o f the tendency to nicking ofthe'wires by cross-lay or one point bearing,

' bearing a mportant, also, in securing compadtness strength ofconstruction, and in prenting the wires from being displaced from inservice, so that vidual wires or layers in service is entirely avoided.

What I claim is: 1.. A wire rope or strand comprising a core, a firstlayer of round wires wound around said core side by side, a second layerof round wires on the first layer, the wires of said second layer beingthe same in number as the wires of the first layer and lying in theinterstices between the wires of the first layer, and a third layer ofround wires upon the second layer, the wires of said third layer beingdouble the number of the wires of the second layer, and alternate wiresof said third layer lying in the interstices be-- tween the wires of thesecond layer and upon the crowns of the wires of the second layer.

2.'A wire rope or strand comprising a.

core, a first layer of round wires wound around said core sideby-side,'a second layer of round wires on the first layer, the wires ofsaid second layer being the same in number as the wires of the firstlayer and lying in the interstices betweenthe wires of the first layer,and a third layer of round wires upon the second layer consisting ofalternatin'g large and small wires, the larger wires being equal innumber .to the wires of the second layer and lying in the intersticesbetween the wires of the second layer, and the smaller wires of theouter layer being equal in number to the wires of the second layer andlying upon the crowns of the wires of the second la er and between thelarger for all the wires Y throughout their length being secured. The,",interloeking' of all the three layers of wire ,the wires of the firstlayer,

strands, each strand comprising a core, a first layer of round-wireswound around said layer being double the number of the wires of thesecond layer, and alternate wires of said third layer lying in theinterstices be tween the wires of the second layer and upon the crownsof the wires of the second layer.-

4. A wire rope consisting of a plurality of strands, each st 'andcomprising a core, a first layer of round wires wound around said coreside by side, a second layer of round. 'WlI'GS on the first layer, thewires of said second layer being the same in number as the wires of thefirst layer and lying in the interstices between the wires' of the firstlayer, and a third layer of round wires upon the second layer consistingof alternating large and small wires, the larger wires being equal innumber to the wires of the second layerand lying in the intersticesbetween the wires of the second layer, and the smaller wires of theouter layer being equal in number to the wires of the second layer andlying upon the crowns of the wires of thesecond layer and betweenthelarger wires of the third layer. A wire rope or strand comprising acore, a first layer of round Wires wound around said core side by side,a second layer of round wires 011 the first layer, the wires of saidsecond layer being the same in number and larger than the wires of thefirst layer and'lying in the interstices between and a third layer ofround wiresupon the second layer, the wires of said third layer beingdouble the number of the wires of the second layer.

6. A wire rope or strand comprising a core, a plurality of layers ofround 'wires upon said core, the wires comprisin eachlayer being thesame in number anc lying in the interstices between the wires of thepreceding layer, and an outer layer of round wires having double thenumber of the wires in each of the preceding layers.

, In testimony whereofiI have .hereunto set my hand, in the presence oftwo subscribing witnesses.

CHARLES G. ROEBLING.

Witnesses E. TH0MPSQN, N. C. HARRISON.

